Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d78fb7b8c755d2…

MALICIOUS

PDF

67.2 KB Created: 2020-03-29 12:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e1b289c2d735350eb9135f61330100b SHA-1: 2c912ddf5b3336fc24ef168387a5ee46c7049251 SHA-256: c3d78fb7b8c755d223b6bde9ab39541b10c062d021ad03a39e74f7af6da744c0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports a malicious intent, likely for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://annotalegal.com/uploads/1/3/0/7/130775490/130775490.html#reglas+juego+canasta+barajas
    • http://wattt.xyz/uploads/1/3/0/3/130313091/lanazamoni.pdf
    • http://deeshasdesign.com/uploads/1/3/0/2/130273576/f186a187924fd.pdf
    • http://kle.ca/uploads/1/3/0/4/130488197/10d6d.pdf
    • http://decalsbycalvin.com/uploads/1/3/1/3/131381706/babukagolisibu_pelag.pdf
    • http://theneighborhoodsocial.com/uploads/1/3/0/6/130604024/4742497.pdf
    • http://vitalpropertysolutions.com/uploads/1/3/1/4/131438067/5378138.pdf
    • http://nicole-carmody.com/uploads/1/3/0/4/130489055/8731141.pdf
    • http://vyberecords.com/uploads/1/3/0/9/130969926/9043058.pdf
    • http://4rtik.com/uploads/1/3/0/5/130589239/1e2126aa.pdf
    • http://brennanace.com/uploads/1/3/0/4/130488754/bejutu.pdf
    • http://ancienthand.net/uploads/1/3/0/3/130323422/d853d7.pdf
    • http://crystalclearplans.net/uploads/1/3/0/7/130776677/mezanomawit_jakidewag_sutiro.pdf
    • http://vittoriovini.net/uploads/1/3/0/8/130814666/xolurubud.pdf
    • http://bostoneducationcompact.org/uploads/1/3/0/7/130738854/5545430.pdf
    • http://handtherapyeducationllc.net/uploads/1/3/0/5/130588294/eea2e5bc3b4566.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd23.bin
c6cccc8f585f2e48b9d57fc455025c2045738e931af42b1d1442a54b7d34cc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 8984 bytes

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